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Mar11-10, 11:25 AM
Yes, the length of a vector changing on transport around a loop is hard to imagine.
Where's the best place to read about this theory ?
I liked Eddington's description -- see #3. The book is public domain and available online at that link.
There are probably mathematical reasons why a scalar deficit can't work as a repository of gravity.
In the Weyl theory it's used as a geometric description of the electromagnetic field, not gravity.